A recent development in low-carbon heating and cooling technology addresses one of the primary retrofit challenges associated with simultaneous four-pipe heat pump–chiller systems. The A-Combo R290 series can now provide flow temperatures of up to 80 degrees Celsius, broadening its suitability for retrofit projects where higher flow temperatures are required. https://purethermal.co.uk/media-news/retrofit-heat-pump-chiller-applications-with-80c-output-capability/